Develop Reference

Removing backslash from JSON format while programmatically constructing a JSON array

I want to parse the JSON data by removing the backslash from the JSON format.
I have tried removing the backslash from the JSON format by the following code but nothing worked out
JSONArray packsJSON = new JSONArray();
JsonObject innerObject;
for(PackageList packageList:selecteditem)
{
innerObject=new JsonObject();
innerObject.addProperty("pack_id",packageList.getSubs_id());
innerObject.addProperty("pack_dsc", packageList.getSubs_desc());
innerObject.addProperty("pack_tax_amt", packageList.getTax_amnt());
innerObject.addProperty("pack_grand_total", packageList.getSubs_grnd_tot_prc());
Log.i("INNEROBJECT","hyu"+innerObject);
packsJSON.put(innerObject);
Log.i("PACKJSON","nkd==>>"+packsJSON)
}
output of INNEROBJECT:
{"pack_id":"39","pack_dsc":"350 Package","pack_tax_amt":"0","pack_grand_total":"419"}
The output of PACKJSON:
[ "{\"pack_id\":\"39\",\"pack_dsc\":\"350 Package\",\"pack_tax_amt\":\"0\",\"pack_grand_total\":\"419\"}",
"{\"pack_id\":\"2232\",\"pack_dsc\":\"Bangara(280)\",\"pack_tax_amt\":\"0\",\"pack_grand_total\":\"280\"}"
]
[
"{"pack_id":"39","pack_dsc":"350 Package","pack_tax_amt":"0","pack_grand_total":"419"}",
"{"pack_id":"2232","pack_dsc":"Bangara(280)","pack_tax_amt":"0","pack_grand_total":"280"}"
]

Your JSONArray is of org.json package and JsonObject is of com.google.gson package
so your innerObject's type should be org.json.JSONObject
JSONArray packsJSON = new JSONArray();
JSONObject innerObject;
for(PackageList packageList:selecteditem)
{
innerObject=new JSONObject();
innerObject.put("pack_id",packageList.getSubs_id());
innerObject.put("pack_dsc", packageList.getSubs_desc());
innerObject.put("pack_tax_amt", packageList.getTax_amnt());
innerObject.put("pack_grand_total", packageList.getSubs_grnd_tot_prc());
Log.i("INNEROBJECT","hyu"+innerObject);
packsJSON.put(innerObject);
Log.i("PACKJSON","nkd==>>"+packsJSON)
}

Please check below answer.
String jsonString = "[ "{\"pack_id\":\"39\",\"pack_dsc\":\"350 Package\",\"pack_tax_amt\":\"0\",\"pack_grand_total\":\"419\"}","{\"pack_id\":\"2232\",\"pack_dsc\":\"Bangara(280)\",\"pack_tax_amt\":\"0\",\"pack_grand_total\":\"280\"}"]"
String outputString = jsonString.replaceAll("\\\\", "");
Log.e("Clear String :", outputString);
OUTPUT

Java: Extract json values as individuals

I have this json in java:
jsonObj = {"ps":["2.16.840.1.113883.6.1","LOINC","2.34"]}
jsonObj is response from an API, so I have it as jsonObject and I don't read it from any file.
Is there an easy way to extract all the values as individuals like jsonObj [1]?

You may Use Gson parsing library as below :
Gson gson = new Gson();
// 1. JSON to Java object, read it from a file.
Staff staff = gson.fromJson(new FileReader("D:\\file.json"), Staff.class);
// 2. JSON to Java object, read it from a Json String.
String jsonInString = "{'name' : 'mkyong'}";
Staff staff = gson.fromJson(jsonInString, Staff.class);
// JSON to JsonElement, convert to String later.
JsonElement json = gson.fromJson(new FileReader("D:\\file.json"), JsonElement.class);
String result = gson.toJson(json);
Gson gson = new Gson();
String jsonInString = "{\"userId\":\"1\",\"userName\":\"Yasir\"}";
User user= gson.fromJson(jsonInString, User.class);
or simply use:
example
JSONObject object = new JSONObject(your_json_response_string);
String IMEICheckResponse = object.getString("getIMEIResult");
for Array use :
//getting whole json string
JSONObject jsonObj = new JSONObject(jsonStr);
//extracting data array from json string
JSONArray ja_data = jsonObj.getJSONArray("data");
int length = jsonObj .length();

You should use a library to deserialize your JSON in a Java Object.
Libraries like GSON, Genson or Jackson.
Once you transform the json in a object, it will have a property called "ps" that will be an array (or a List)

Converting json string to JSONArray in java?

I have this json string returned from a 3rd party api
{"msg":"xff","uuid":"44037b67-3629-4325-83e5-7a00cb78dfdf"}
When I try to parse it by the below code
JSONArray json = new JSONArray(message.toString());
JSONArray arr = json.getJSONArray(0);
String mess = arr.getJSONObject(0).getString("msg");
String uuid = arr.getJSONObject(0).getString("uuid");
System.out.println("message : "+mess);
System.out.println("uuid : "+uuid);
I get this below exception
org.json.JSONException: Value {"msg":"xff","uuid":"44037b67-3629-4325-83e5-7a00cb78dfdf"} of type org.json.JSONObject cannot be converted to JSONArray
What other way can I parse it?

You can use JSONObject instead:
JSONObject obj = new JSONObject(message);
String mess = obj.getString("msg");
String uuid = obj.getString("uuid");
System.out.println("message : "+mess);
System.out.println("uuid : "+uuid);

Android json parsing without array name

I have a Json Array as string without name and I want to parse it how can i do it in android ?
My array :
{"emp_info":[
{"id":"1","groupe":"1","professeur":"1"},
{"id":"2","groupe":"2","professeur":"1"}
]}

This is how you can parse it
Assuming your json string is data
JSONObject jsonObj = new JSONObject(data);
JSONArray empInfo = jsonObj.getJSONArray("emp_info");
for(int i = 0; i < empInfo.length(); i++){
JSONObject obj = empInfo.getJSONObject(i);
String id = obj.getString("id");
String groupe = obj.getString("groupe");
String professeur = obj.getString("professeur");
}

The example json you gave has a name, but if it doesn't this is how I do it. Using Gson to parse JSON, I use TypeToken to tell the gson builder it's an array.
List<MyObject> jsonObject = new Gson().fromJson(json, new TypeToken<List<MyObject>>().getType());
With the following code you'll have an object representation of your json array.

Is JSON same with GSON?

I have tried to run following code
Gson gson = new Gson();
String json = gson.toJson(result);
JSONObject jsonResponse = new JSONObject();
jsonResponse.put("sEcho", echo);
jsonResponse.put("iTotalRecords", iTotalRecords);
jsonResponse.put("iTotalDisplayRecords", iFilteredTotalRecords);
jsonResponse.put("aaData", json);
jsonResponse.toString();
JSONArray data = new JSONArray();
for (Object obj : result) {
JSONArray row = new JSONArray();
User user = (User) obj;
row.put(user.getId()).put(user.getUserName()).put(user.isEnabled());
data.put(row);
}
JSONObject jsonResponse2 = new JSONObject();
jsonResponse2.put("sEcho", echo);
jsonResponse2.put("iTotalRecords", iTotalRecords);
jsonResponse2.put("iTotalDisplayRecords", iFilteredTotalRecords);
jsonResponse2.put("aaData", data);
jsonResponse2.toString();
The result from toString function for both jsonResponse are as follows:
{"iTotalDisplayRecords":11,"iTotalRecords":11,"aaData":"[{\"creationTime\":0,\"enabled\":true,\"id\":1,\"loginDuration\":0,\"online\":false,\"password\":\"asda\",\"userName\":\"abiieez\"}]","sEcho":"1"}
{"iTotalDisplayRecords":11,"iTotalRecords":11,"aaData":[[1,"abiieez",true]],"sEcho":"1"}
I would like to eliminate the " symbol before [ and after ] from the first json response just like the second one (I noticed that the " is added after the array being put to the jsonResponse object). How can I accomplish this ?

Since you first convert your "result" to a String, and then add it to aaData, it will end up quoted, like a String should. If all you'd like to do is to remove the quotes, you could do something like this in line 2:
String json = "##" + gson.toJson(result) + "##";
and this in line 8:
jsonResponse.toString().replace("\"##", "").replace("##\"","");
(of course you need to choose the "quote marker" ## such that it will never appear as actual string content in your data anywhere else)
But the cleaner solution (although probably slower) would likely be to convert your String to an actual JSONObject by changing line 2 to:
JSONObject json = new JSONObject(gson.toJson(result));